Hide Drop Down date with CSS

/* Gravity form (Launchpad book a tour) Hide Drop-down years keeping first 11 options */
select#input_7_9_3 *:nth-child(n+12),select#input_7_14_3 *:nth-child(n+12),select#input_7_19_3 *:nth-child(n+12) {
    display: none;
}